// Boost.Geometry (aka GGL, Generic Geometry Library) // QuickBook Example // Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands. // Use, modification and distribution is subject to the Boost Software License, // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) //[equals //` Shows the predicate equals, which returns true if two geometries are spatially equal #include <iostream> #include <boost/geometry.hpp> #include <boost/geometry/geometries/polygon.hpp> #include <boost/geometry/geometries/adapted/boost_tuple.hpp> BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian) #include <boost/assign.hpp> int main() { using boost::assign::tuple_list_of; typedef boost::tuple<int, int> point; boost::geometry::model::polygon<point> poly1, poly2; boost::geometry::exterior_ring(poly1) = tuple_list_of(0, 0)(0, 5)(5, 5)(5, 0)(0, 0); boost::geometry::exterior_ring(poly2) = tuple_list_of(5, 0)(0, 0)(0, 5)(5, 5)(5, 0); std::cout << "polygons are spatially " << (boost::geometry::equals(poly1, poly2) ? "equal" : "not equal") << std::endl; boost::geometry::model::box<point> box; boost::geometry::assign_values(box, 0, 0, 5, 5); std::cout << "polygon and box are spatially " << (boost::geometry::equals(box, poly2) ? "equal" : "not equal") << std::endl; return 0; } //] //[equals_output /*` Output: [pre polygons are spatially equal polygon and box are spatially equal ] */ //]